Countermark

https://rpc.ashmus.ox.ac.uk/countermark/1184 
GIC
bearded head (Septimius Severus?), r. (oval punch)
oval 
5 x 4 mm 
on a coin of Nysa (Lydia) 

Coins with this countermark

Number Image TypeNumber CoinNumber VolumeNumber
RPC IV, 10169 (temporary) Show 2491 1 4.2